When opening the scanner on my HP 4650, got a series of pop up warning that this software was from an unknown source and will damage the computer. Followed HP's fix (downloaded and ran uninstaller, looked up the right driver and installed it). Those steps all sent smoothly. I can print but get the same warning messages when I try to open the scanner, and scanner tries to open but can not showing "Failed to Open a Connection to the device -21345).
Redid the HP fix steps but this time rebooted after running the uninstaller, rebooted after re-installing the printer), but get same message and unable to scan.
Thank you Shlomi for the link to the software install (it was different than what I got from the HP website when I entered my model).
Yet, throughout the set up process, I got many warnings that this software "will damage my computer", which I just clicked through by hitting OK. In the end, the test of the printer was successful, but not the scanner. Its been 20 minutes and it is still trying to connect with scanner
Be alert for scammers posting fake support phone numbers and/or email addresses on the community. If you think you have received a fake HP Support message, please report it to us by clicking on "Flag Post".